The low-fi haze and ramshackle post-punk of the first two records by these self-made indie heroes are mostly gone on album three, replaced by confident songs festooned with shiny hooks. That’s not to say that an alienated dance rocker like “Ketamine and Ecstasy” is going to soundtrack iCarly. But it could. The epic closer “Adam’s Plane,” with its ambient noise and piano hammering, bridges the old and new approaches, showing a band that can scale up without losing its underdog spirit.